The numerical jaffa cake

Unlike Macavity, I’m no good at doing complicated long division sums, so when my calculator broke there was a lot of muttering and counting on fingers and finally scrabbling through the stocking-fillers of yesteryear.

The tiny buttons are very fiddly to use, as the whole thing is just the right size and profile to be a jaffa cake. But luckily it is rather better than the average jaffa cake at arithmetical calculation.